In maize, approximately 10% of imprinted genes are variably imprinted in the endosperm tissue of five reciprocal hybrid pairs [19]. As noted above, imprinting can also be variable within species, meaning that a subset of genes is maternally expressed gene (MEG) or paternally expressed gene (...
Specific chemical modifications to the DNA, such as methylation, appear to give the chromosomes a ‘memory’ as to their parental origin. These ‘epigenetic’ imprints, from the Greek meaning ‘on top of’, modify the structure of the DNA but not its sequence. In addition to parental modifica...
Spencer [19] first extended the standard two-allele one locus model of quantitative genetics to account for imprinting. Following the approach of Spencer [19], consider an autosomal biallelic locus with allelesA1andA2at frequencies 1−qandq, respectively, in the population. Allele frequencies of ...